Single crystal elasticity of iron-bearing bridgmanite under lower-mantle conditions by the inelastic x-ray scattering method

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H02004
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 17040:Solid earth sciences-related
• Research Institution: Japan Synchrotron Radiation Research Institute (2022); University of Hyogo (2019-2021)
• Principal Investigator: FUKUI Hiroshi 公益財団法人高輝度光科学研究センター, 精密分光推進室, テニュアトラック研究員 (90397901)
• Co-Investigator(Kenkyū-buntansha): 米田 明 大阪大学, 大学院理学研究科, 招へい研究員 (10262841) ; 芳野 極 岡山大学, 惑星物質研究所, 教授 (30423338) ; 中塚 晃彦 山口大学, 大学院創成科学研究科, 准教授 (80294651) ; 鎌田 誠司 東北大学, 理学(系)研究科(研究院), その他 (30611793)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: ブリッジマナイト / 弾性波速度 / X線非弾性散乱 / 下部マントル / 単結晶 / ダイヤモンドアンビルセル

Outline of Final Research Achievements

Iron-bearing bridgmanite is one of main components of the Earth's lower mantle. The single crystal elasticity of this material under the lower mantle conditions is essential to understand the lower mantle from the viewpoint of material sciences. There are several techniques to determine elastic property of materials. We have used inelastic x-ray scattering (IXS) technique which can be adopted to opaque and tiny single crystal under extreme conditions. We have performed the synthesis and characterization of iron-bearing bridgmanite single crystals and developed IXS techniques on high-pressure single crystals in parallel. Finally, we have obtained precious data on the single crystal elasticity of the iron-bearing bridgmanites under high-pressure conditions.

Free Research Field

高圧物質科学

Academic Significance and Societal Importance of the Research Achievements

含鉄ブリッジマナイトは下部マントル主要構成物質である。下部マントル条件下での単結晶弾性率は地球下部マントルを物質科学的に理解するために必要不可欠な物理量である。